Instruction: Explain the role of the _app.js file in a Next.js application.
Context: This question evaluates the candidate's knowledge of the _app.js file's purpose, including its role in initializing pages.
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First, it's essential for implementing global CSS styles. Unlike traditional React applications where you might import a global stylesheet in your index.js, Next.js leverages _app.js for this purpose. This approach ensures that global styles are consistently applied across all pages without the need to import them in each page component. My projects have greatly benefited from this streamlined styling method, ensuring a uniform look and feel across the application.
Furthermore, the _app.js file is indispensable for maintaining state or passing down props to all pages within the application. For instance, in...